模板 

大数据平台

	

Throughput: the number of tasks that can be completed within a given time interval
Response time: the amount of time it takes to complete a single task from the time it is submitted


Scale up -- Speed up
Scale up: 任务量变多，processor变多，但完成时间不变。
Speed up: 任务量不变，processor变多，完成时间减少。